Raw upper air data is routinely ingested by numerical models. (en.wikipedia.org)
The Climate Central analysis of San Joaquin Valley air data showed that while the number of days each year on which levels of PM2.5 exceeded federal standards declined by about 45 percent overall from 2000 to 2016, they increased by almost a third during the peak summer fire season. (climatecentral.org)
Hi Nick, when I heard about Richardson's claims of tas vs ts I remembered the nighttime sea air data set that Karl (2015) used to calibrate cooling on bucket temps against ship boiler intakes. (climateaudit.org)